TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
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TM 9-2815-220-24 PISTONS, RINGS, AND ASSOCIATED PARTS REPLACE/REPAIR 0142 00 ASSEMBLY NOTE Piston rings are marked to indicate which side goes up. Check marking on rings and install the upper (tapered) compression ring and the two intermediate compression rings with the marking "TOP" or "•" mark toward the piston dome. Oil control rings are symmetrical and may be installed with either side up. Piston rings should be installed starting with the lowermost ring so that no ring has to pass over another during installation. During installation, expand rings only enough to slide ring over body of piston and into the proper groove. Install all rings using remover and replacer (item 78, WP 0176) as shown. 1. Install oil control ring (3). a. Install expander spring (6) in groove number four of piston (4) by joining at parting line. CAUTION Use care in installing rings to avoid damaging ring lands or distorting rings. Rings are easily broken, do not expand any more than necessary to accomplish installation. b. Using remover and replacer (5) (item 78, WP 0176), install oil control ring (3) over expander spring (6) in groove four of piston (4). 2. Install compression rings (1, 2) lowermost first, in a similar manner. 1 2 5 3 6 6 4 2 WP 0142 00-11